Abstract
0009-3092/05/4102–0104 © 2005 Springer Science+Business Media, Inc. Crudes from the Karazhanbas field exposed to thermooxidation during in-situ combustion [1-3] have been investigated for many years in the Department of Organic Chemistry and Petroleum Chemistry at I. M. Gubkin Russian State University of Oil and Gas to develop methods of controlling combustion to maintain the assigned process parameters. Samples of the crudes were collected for analysis in different parts of the field near the hypothetical combustion front. They were carefully dehydrated before the study in a specially designed apparatus, a rotating evacuated glass cylinder with a perforated pocket for a paper cartridge containing calcium chloride, heated to 50°C. A small amount (2-3 g) of crude containing emulsified water was placed inside the cylinder. When the cylinder was rotated, a thin film of crude formed on the inside, and water was gradually removed from it, absorbed by the calcium chloride. Total dehydration of the sample required 2-3 h. Distillation of the dehydrated samples was investigated by chromatographic distillation. The IR spectra were made on a Specord instrument in a thin layer in the 700-4000 cm wavenumber range. The olefin content in the crudes was determined by ozonometry on an ADS-4M using eluates of samples of crudes obtained by liquid-adsorption chromatography (LAC) on ASK silica gel (eluent – n-heptane, n-heptane:crude:silica gel = 60:1:20). In ozonometry, a solution of stilbene in n-heptane of 2⋅10-5 M concentration was used as the standard. The content C C=C (%) of C=C groups was calculated with the equation:
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